KDE 4.11.1 has been released. This release only contains bugfixes and translation updates and will be a safe and pleasant update for everyone.
More than 70 recorded bugfixes include improvements to the Window Manager KWin, the file manager Dolphin, and others. Users can expect Plasma Desktop to start up faster, Dolphin to scroll smoother, and various applications and tools will use less memory. Improvements include the return of drag-and-drop from taskbar to pager, highlighting and color fixes in Kate and MANY little bugs squashed in the Kmahjongg game. There are many stability fixes and the usual additions of translations.
At the moment of writing this tutorial, the Kubuntu Backports PPA doesn’t update yet. Once updated, you can run below commands one by one in terminal to upgrade in (K)Ubuntu 13.04, (K)Ubuntu 12.10, (K)Ubuntu 12.04.
sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt-get update
sudo apt-get upgrade